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Balance Sheet Details - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Details [Abstract]    
Materials $ 51,644 $ 39,765
Work-in-process 22,935 20,923
Finished goods 9,643 6,833
Total inventories $ 84,222 $ 67,521